Muffler with a hemispherical outer wall having a plurality of apertures of various sizes and shapes



Get. 6, 1953 c. woons 2,654,437

MUFFLER WITH-A HEMISPHERICAL OUTER WALL HAVING A PLURALITY OF APERTURESOF VARIOUS SIZES AND SHAPES Filed Aug. 10, 1951 E OQZHHHOEW gvnquogmvEPA/[5r 0 14/0005 Patented Oct. 6, 1953 UNITED STATES PATENT OFFICEMUFFLER WITH A HEMISPHERICAL OUTER WALL HAVING A PLURALITY OF APER-TURES OF VARIOUS SIZES AND SHAPES Ernest 0. Woods, Omaha, Nebr.

Application August 10, 1951, Serial No. 241,187

4 Claims. 1

This invention relates to a novel muffler or exhaust silencer forinternal combustion engines and more particularly to a mufiier havingnumerous small outlets in a variety of sizes and shapes which willefiectively break up the sound waves from the exhaust of internalcombustion engines to reduce the noise to a minimum.

Another object of the invention is to provide a mufiier of extremelysimple construction which is capable of being readily mounted on theoutlet end of an exhaust pipe and from which the exhaust gas will bereleased to the atmosphere through a multiplicity of restricted openingsof a variety of sizes and shapes to thereby most effectively separatethe exhaust gases as they are discharged to the atmosphere to effect amaximum mufiling of the sound of the engine.

Another object of the invention is to provide a muflier capable of beingreadily made in various sizes for fitting internal combustion engines ofvarious sizes which may be employed effectively either with motorvehicle propelling engines or stationary engines and which may be veryeffectively utilized with small low horse power engines or largestationary or vehicle engines.

A further object of the invention is to provide a muffler which can bevery economically manufactured and sold yet which will be extremelyefiicient and durable.

Various other objects and advantages of the invention will hereinafterbecome more fully apparent from the following description of thedrawing, illustrating a preferred embodiment thereof, and wherein:

Figure 1 is a side elevational view of the rear portion of a motorvehicle showing the muffler applied thereto;

Figure 2 is an enlarged top plan view of the mufiier;

Figure 3 is a side elevational view thereof;

Figure 4 is an end elevational view looking from left to right ofFigures 2 and 3;

Figure 5 is an enlarged substantially central sectional view takensubstantially along a plane as indicated by the line 55 of Figure 2, and

Figure 6' is a fragmentary plan view of a portion of a flat sheetillustrating a preferred arrangement of the muffler discharge apertures.

Referring more specifically to the drawing, the novel mufller or exhaustsilencer constituting the invention is designated generally '5 and inits preferred form as illustrated in the drawing, includes an inner endwall 6 which is substantially disk shaped and has a centrally disposedboss 3 projecting from one side thereof and an annular peripheral flangeit which projects from its opposite side and which is likewise disposedsubstantially perpendicular to the plane of said wall 8. The mufiler orsilencer I also includes a substantially hemispherical outer wall H theopen side of which fits snugly over and is suitably secured to theflange ID, as by welding, as seen at l2. The hemispherical outer wall His provided with a plurality of rows of exhaust or discharge aperturesor openings, in the embodiment as disclosed, the outer wall ll beingshown provided with four such rows designated generally I3, [4, l5 and[6, each of which rows is preferably substantially straight fromend-to-end thereof so that the intermediate portions of the rows ofopenings or apertures are spaced a greater distance apart than the endportions thereof, as is illustrated in Figures 3 and 4. However, it willbe understood that the number of rows of discharged openings orapertures may be varied depending upon the size of the muffler l and thesize of said muffier may vary depending upon the size of the internalcombustion engine with which it is employed.

Figure 6 is a plan vieW only intended to illustrate the arrangement ofthe individual openings of the rows of openings and is not intended toshow the spacing of these rows of openings relatively to one another,which is clearly shown in Figures 2 to 5. The four rows of openings asshown in Figure 6 are numbered from top to bottom corresponding ,to thearrangement of the four rows of openings as shown in Figures 3, 4 and 5.As illustrated in Figure 6, each of the four rows of openings includes agroup of longitudinally elongated openings l'. of which there ispreferably three, a group oi circular openings [8 arranged in transversealignment and likewise preferably including three openings and which arefollowed by a substantially V- shaped transversely disposed opening E9.Each row of openings also includes three transversely extending wavyopenings 20 and three longitudinally extending undulating or wavyopenings 2|. Immediately to the left of the openings 2! there is an ovalshaped opening 22 disposed transversely of the row, followed by threetrans versely extending openings 23 each of a shape correspondingsubstantially to the opening H but disposed transversely rather thanlongitudinally of the row. Another transversely disposed V-shapedopening I9 is disposed to the left of the openings 23 followed byanother series of openings 18 and another opening 22. The row ofopenings l3 commences with a series of opcnings I! and preferablyterminates with the series of openings l8 followeclby the opening 22while the next row l4 disposed therebeneath commences with a series ofopenings l8 followed by an opening l9 and terminates with a series ofillustrated and designated generally 28.

openings 11. The next to the bottom row 15 commences with an opening 19,followed by a series of openings 20 and terminates with the series ofopenings I8 disposed immediately to the left of aseries of openings 11.The bottom row l6 commences with a series of openings 20 and terminateswith an opening [9 disposed immediately to the left of the series ofopenings it.

It will be understood that a greater or lesser number of openings H to23' could be provided in each of the four rows of openings for varyingthe total overall discharge area afforded by said openings. It will alsobe noted that the bottom row of openings I6 is disposed substantially atthe bottom-most part of the muffler i so that the openings disposedintermediate of the ends of the row It will additionally functioneffectively as drainage openings to permit condensation or othermoisture to drain from the interior of the mufiler I.

The outlet end of an internal combustion engine exhaust pipe 2c isdisposed in the boss and may be suitably securedthereto in any desiredmanner, as by soldering, as indicated at 25, so that the exhaust pipedischarge end 26 opens into the interior 26 of the mufller i. I'lcemufiler l is also provided with a pluraiity of diagonal braces 22?having outer ends which are secured in anysuitable manner as by welding,as indicated at 12, to the outer surface of the wall 8 and havingopposite adjacent ends which are soldered or otherwise suitably securedas indicated at 25 to circumferentially spaced portions of the exhaustpipe 2 When the mufiler or exhaust silencer i is mounted on thedischarge end of the exhaust pipe 24 of a motor vehicle engine it willordinarily be disposed adjacent the rear end of said vehicle, asillustrated in Figure 1, wherein a portion of the rear end of a motorvehicle is However, it will be apparent that the muiller or silencer imay be mounted on the discharge end of an exhaust pipe 25 located in anydesired position and unlike most mufilers does not require a tail pipeas the exhaust gases discharge to the atmosphere directly from themufiler.

The multiplicity of discharge openings or apertures afforded by the fourrows 13, I i, 15 and 16 will effectively function not only to materiallybreak up and difiuse the exhaust gases discharged from the mufiier l butalso to similarly affect the sound waves to reduce the sound emittedfrom the mufller to a minimum. Likewise, any condensation within mufilerchamber 26 will readily drain through the openings or apertures locatedintermediate of the bottom row it so that damage to the mufiier throughrust or corrosion will be reduced to a minimum.

As previously stated, the size of the muffler or silencer i may bevaried depending upon the size of the engine with which it is to be usedand the number of rows of discharge openings or apertures may also bevaried and the number of openings or apertures provided in each row maylikewise be increased or decreased in number from the number illustratedin Figure 6. Various other modifications and changes are likewisecontemplated and may obviously be resorted to, without departing fromthe spirit or scope of the invention as is hereinafter defined by theappended claims.

I claim as my invention:

1. A mufiler for an internal combustion engine comprising a body portionconsisting of a substantially hemispherical outer wall and asubstantially flat inner wall secured to and closing the open side ofsaid outer wall and combining therewith to define a substantiallyhemispherical exhaust chamber, said inner wall having a central openingadapted to receive the discharge end of an exhaust pipe from which theexhaust gases and sound waves are discharged into said exhaust chamber,said outer wall being provided with a plurality of substantiallystraight rows of discharge openings and apertures, said rows beingcircumferentially spaced relatively to one another and each including amultiplicity of apertures of various sizes and shapes through which theexhaust gases and sound waves are adapted to be discharged to theatmosphere for breaking up and diiiusing the exhaust sounds, saidexhaust chamber communicating with the atmosphere only through saiddischarge openings and apertures.

2. An exhaust mufller as in claim 1, the intermediate portions of therows of openings being spaced a greater distance apart than the endportions thereof, the end portions of each of said rows of openings andapertures being disposed at substantially the same level, one of saidrows of openings and apertures having an intermediate portion disposedin substantially a bottom-most position relatively to the mufiier bodywhereby the openings and apertures of said intermediate portion formdrainage openings for the exhaust chamber.

3. A murder or exhaust silencer comprising a hollow body portionincluding a substantially fiat inner wall and a concavo-convex outerwall combining with said inner wall to define a hemispherical mufilerchamber, said inner wall having an opening adapted to engage thedischarge end of an exhaust pipe for mounting the mufiier thereonwhereby the exhaust gases and sound waves from the exhaust pipe will bedischarged into said mufiier chamber, said concave-convex outer wallhaving a plurality of rows of discharge openings and apertures, saidmufiler chamber communicating with the atmosphere only through saiddischarge openings and apertures, each of said rows being substantiallystraight and including a multiplicity of openings and apertures of avariety of sizes and shapes through which the exhaust gases and soundwaves are adapted to be emitted to the atmosphere from the muffierchamber and diffused and broken up for reducing the exhaust sound to aminimum.

4. A mufiler or exhaust silencer as in claim 3, certain of said openingsor apertures being disposed adjacent the bottom-most portion of the'mumer and forming drainage openings for moisture and condensationaccumulatin in said mufiler chamber.

ERNEST C. WOODS.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 859,414 Smith July 9, 1907 1,128,306 Goelzer Feb. 16, 19151,333,676 Rapattoni Mar. 16, 1920 2,037,884 Day Apr. 21, 1935 2,061,903Hartsock Nov. 24. 1936 FOREIGN PATENTS Number Country Date 22,089 GreatBritain June 4, 1908 324,738 Italy Feb. 14, 1935

